Ball valve



FIG. 1 is a top, front perspective view of a ball valve;

FIG. 2 is a top, rear perspective view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is an opposite side view thereof; and,

FIG. 6 is a top view thereof.

The broken lines showing unclaimed portions of the ball valve form nopart of the claimed design.

The ornamental design for a ball valve, as shown and described.